fulfillments/create webhook not firing

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1. Registered Fulfillment service through API
2. Created products with my fulfillment assigned to them
3. Subscribed to fulfillment/creation and fulfillment/update Webhook for Fulfillment Notifications
4. Created the order, initiated the fulfillment from shopify admin, this will generate the Create Fulfillment request
5. My app didn't receive the fulfillment notification which it used to before setting the  "fulfillment_orders_opt_in": true, but not anymore and am clueless.

Please help me, is there a step that I am missing.
I have a deadline to catch for our store launch but we are stuck with this Order fulfillment for the last 3 days; and have tried registering at least 5 services but all in vain

Ahsan Ali